Regulated bootstrap power supply
AssigneeOtis Elevator Company
InventorsDaryl J. Marvin, Steven M. Millett
Life of this patent
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Abstract
An exemplary power supply includes a low side switch and a high side switch. A driver controls operation of the high side switch. A bootstrap capacitor supplies power to the driver. An energy storage portion is in parallel with the bootstrap capacitor to provide control over whether a voltage of the bootstrap capacitor drops below a desired voltage. A voltage regulator is in parallel with the bootstrap capacitor for limiting current provided to the bootstrap capacitor and for regulating a voltage of the bootstrap capacitor.
Claims17
A power supply, comprising:
- a low side switch;
- a high side switch;
- a driver that controls operation of the high side switch;
- a bootstrap capacitor that supplies power to the driver;
- an energy storage portion in parallel with the bootstrap capacitor;
- and
- a voltage regulator in parallel with the bootstrap capacitor for limiting current provided to the bootstrap capacitor and for regulating a voltage of the bootstrap capacitor.
A method of controlling power supply from a bootstrap capacitor to a driver that controls a high side switch, comprising the steps of:
- providing an energy storage in parallel with the bootstrap capacitor, the energy storage providing control over whether a voltage of the bootstrap capacitor drops below a desired voltage used to power the driver;
- and
- regulating the voltage of the bootstrap capacitor using a linear regulator in parallel with the bootstrap capacitor.
Dependencies are inferred from the claim text.